[lathiat]

If you think bit flipping is rare, check out this write-up: http://dinaburg.org/bitsquatting.html

Bitsquatting: DNS Hijacking without exploitation

When bit-errors occur they can change memory content. Computer memory content has semantic meaning. Sometimes, that meaning will be a domain name. And applications utilizing that memory will use the wrong domain name.

[ianai]

Nice point. As with all things that follow a distribution and given the large number of machines this error will occur.